Global patent index - EP 0974143 A1

EP 0974143 A1 2000-01-26 - APPARATUS AND METHOD FOR SENSING DISK-DRIVE HEAD-ARM SPEED DURING HEAD LOADING

Title (en)

APPARATUS AND METHOD FOR SENSING DISK-DRIVE HEAD-ARM SPEED DURING HEAD LOADING

Title (de)

GERÄT UND VERFAHREN ZUR DETECTION DER GESCHWINDIGKEIT EINER KOPF-ARM-VORRICHTUNG WÄHREND DER KOPFLADUNG IN EINER PLATTENLAUFWERK

Title (fr)

APPAREIL ET PROCEDE DE DETECTION DE LA VITESSE DU BRAS DE LA TETE D'UNE UNITE DE DISQUES PENDANT LE CHARGEMENT DE LA TETE

Publication

EP 0974143 A1 (EN)

Application

EP 99906777 A

Priority

  • US 9902596 W
  • US 1984098 A

Abstract (en)

[origin: WO9940585A1] Apparatus for estimating the speed of a disk drive's head arm during loading of the drive's read/write head onto a disk platter. The speed is estimated by a model of the head-arm actuator plant. The model is implemented by a digital state machine that tracks the head-arm's velocity, friction and voice-coil motor (VCM) current using a readily available sense voltage which is based on the VCM current. The apparatus of the invention is particularly advantageous because it allows a head-arm control system to have sufficient control over the head arm's movements so as to prevent the drive's read/write head from crashing into and damaging the drive's data recording surface.

IPC 1-7 (main, further and additional classification)

G11B 21/12

IPC 8 full level (invention and additional information)

G11B 21/02 (2006.01); G11B 21/12 (2006.01)

CPC (invention and additional information)

G11B 21/12 (2013.01)

Citation (search report)

See references of WO 9940585A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9940585 A1 19990812; EP 0974143 A1 20000126; JP 2001519961 A 20011023

INPADOC legal status

2002-03-20 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010831

2000-04-05 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000207

2000-01-26 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE